The current world averages for \(R(D)\)  and \(R(D^*)\) , combining the results reported in Refs. [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]} are as follows [10]}:
\(R(D)&=&0.340\pm 0.027\pm 0.013,\numero \\R(D^*)&=&0.295\pm 0.011\pm 0.008.\) 
